Baltimore County police have charged a 9-year-old boy with second degree assault after he choked a fellow student from Cromwell Valley Elementary School on their bus ride home earlier this month.

Police said bus surveillance video of the Nov. 10 incident showed the 9-year-old suspect get up from his seat, walk over to another 9-year-old boy who was still seated and wrap both his hands around the victim’s neck.

Students on the bus told police that the suspect choked the boy until he appeared to lose consciousness, according to police. The incident occurred at around 4:40 p.m. when the bus was at the intersection of Wycliffe Avenue and Ryewood Road.

The attack appeared to be unprovoked, according to police.

A call for service report stated that the victim may have also gone into cardiac arrest, but police said further investigation revealed that was not the case.